yep,
I am bantam man all the way too.
Yes the are bantam sumatras, I have them in black and blue too, also pretty sure there are bantam yokos and cubalayas.
They mainly were bred down, also honestly there has been tons of work done on them in crosses as well, so the best thing would be to do some reaserch with your breeders and find out what they have mine are the American phoenix, there are also the nonmolting lines of onagadori as well.
They dont really perch more that I have seen. Where that comes from probley, is the fact that to get the massive tails, it's best to keep solitary male in pens called Tomebako's. These are up right boxes with a perch in the top. The tail is free to hang down to the ground and not be trampled on by other birds, get muddy from rain, etc etc all the stuff that would other wise break the feathers.
Also, diet plays a large role on how long the tails get too, and a male kept away from females, will not molt as often either. Hens trigger a hormone reaction that will cause them to go into molt.
This is just if you want to grow the most massive tails possible. I just enjoy them, and keep them like all my other bantams, and a 3 foot tail and converts dragging the ground is fairly common.
I should have a few eggs or chicks available this year, jsut waiting to see what colors, mine are going to produce before I tell anybody anything. I also know several excellent breeders, but they are proud of them, nonmoulting lines run from $50-$100 per dozen on eggs, american phoenix are in the $40-$60 range per dozen but are from the best breeders in the country too.